K and B Chapter 3 self test qn no 12

[kiruthigha rajan]

3. class Box {
4. int size;
5. Box(int s) { size = s; }
6. }
7. public class Laser {
8. public static void main(String[] args) {
9. Box b1 = new Box(5);
10. Box[] ba = go(b1, new Box(6));
11. ba[0] = b1;
12. for(Box b : ba) System.out.print(b.size + " ");
13. }
14. static Box[] go(Box b1, Box b2) {
15. b1.size = 4;
16. Box[] ma = {b2, b1};
17. return ma;
18. }
19. }

What is the result?
A. 4 4
B. 5 4
C. 6 4
D. 4 5
E. 5 5
F. Compilation fails

can anyone explain how the answer is A.im confused with values passed here..

[John Jai]

ba[0] and ba[1] both holds the reference b1 which has its size set as 4 in the go() method.

[Seetharaman Venkatasamy]

read this small Story

[kiruthigha rajan]

John Jai wrote:ba[0] and ba[1] both holds the reference b1 which has its size set as 4 in the go() method.

When Box[] ba = go(b1, new Box(6)); reaches the go method the value contained is 5 and 6
then b1.size becomes 4,and b2 remains 6
this is placed in an array ma wer b2,b1 contains 6,5
then ma and ba shares the same array object.
here ba[0] is assigned to b1 which is 4
so this prints 4,4
am i right??
correct me if i am wrong..
thanks in advance

[Praveen Kumar M K]

kiruthigha rajan wrote:

John Jai wrote:ba[0] and ba[1] both holds the reference b1 which has its size set as 4 in the go() method.

When Box[] ba = go(b1, new Box(6)); reaches the go method the value contained is 5 and 6
then b1.size becomes 4,and b2 remains 6
this is placed in an array ma wer b2,b1 contains 6,5
then ma and ba shares the same array object.
here ba[0] is assigned to b1 which is 4
so this prints 4,4
am i right??
correct me if i am wrong..
thanks in advance

At line 16, "ma" contains 6,4 owing to the assignment in the previous step.

[kiruthigha rajan]

At line 16, "ma" contains 6,4 owing to the assignment in the previous step

yeah typing mistake...
thanks alot